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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590e03f9b445ae833f0e475a60235e8ad70d2c4bb0bc35d8cfa251a4d81d6023' 
  AND token = 'LB2hUZuNTn8c/L5Cn2qsq1AnHGk4L6/XrS8Qy78V5ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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