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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3022ad00ac28b245d9ba7ee839329ff6df53080133e5cc9eb8ff17abcdf5d7a1' 
  AND token = 'wJWF0WnpYHoIdnBRbM3RO+QlDdhfEeo5x+V6dRcZF0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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