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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b237053f9de3af9ec4a4476fef9cd00f3a756d701380228f216ca3378ade8fb9' 
  AND token = 'u2U7sQ001w5wic4jCuVbR/UtQ5uUtr7EqDIaCSQdVLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}