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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe083eded8ebd4c4f6c1d30dd9b1582e093757ad6d2ef4cd3c924c12b5bee045' 
  AND token = 'fAD5YsrCm/Q8UD4pMhPvbc4xNJj7z/3w14PHp0ifPeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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