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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7866970b6a705946ec154ba7a7210f5cc5f4d1d3d80ffcdd14d81a22867e0c' 
  AND token = 'oKNS9lSL2fj8V5ZsUW1+2wMIQ5uF2TPADLsdZn9+KlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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