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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed27077c4688bc9a72ba81bfe939efca1aa2fb793894fcec235fcf842aba2d7' 
  AND token = 'Rs5njS4bxKd/Hv86r3pw9K9pAMt0MEO/+MA1lfkSdy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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