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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cd4e9e5b223f2207344f4190b85af61242d7a7e2a9301e6d012635ca0b7817' 
  AND token = 'ih0ag7ISC571VXGrJb/rfTCZGrys51E0fFmPSTDy79Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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