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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c716bac62e4dd711f0b510fed739634b4403ad28a592b8eeed6d2ee1a93f71' 
  AND token = 'ecBws2eGrFoaWRS0ssYYCZ60WULeNuRaQxBKiSeBdsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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