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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e4b0fafb2c7f0ba5c3569e5904f0017637847b905e0d8149ec790782a08c46' 
  AND token = 'fDjHOCoAmQnBcFWOZlFsQU4u14vFwvVxLa7G+Wf7yRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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