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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b27539a84a0a3e2fa772dfe5b261c6615aacc7e3798cd85b690ebbd792cd1f' 
  AND token = 'LloJmjyl3iPr9vgIW8rgvzsOYoXvjs5glvIAekrp2C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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