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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f248f407354950a7d0a92e5926d927526caa0a0a196be011ad44c7143adf47' 
  AND token = '5TKK/EjAc61Gjt1VvRtI1FX9/5A1CibuI+BNIWCLqMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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