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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7771b7378c7866b6e5dc0bf54da2a5886f4e214a6d880db0d4bba6d97f03e09d' 
  AND token = '4kUEHxbcC8IOxlAPuKJaOYbujPXszJMV4lDJVyH4buY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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