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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb3fce5893b394824a8a0fe66136caa1ff725159f22f2b57d50c815bffa0c6b' 
  AND token = 'v1uydVbCCcYmaD/Bb0A0TyV3rcC/YCWGdAVZXrf8UgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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