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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b027f5ec83d39ee9fbb9035344c44cec0984bc9745af2c58042162d93be9237f' 
  AND token = '0uNClLQFGqBTZbgXFc9aJrqCsz/k7bpiEFoWi9cKdVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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