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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20720a4dd2af6efa829733f659b7a8396f6b92a0e6e41b319371d734ab690d9' 
  AND token = 'aS1oiQ1QPC9u3X6s9YRWJI2MCmPLvUvq4Odj4Z24rSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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