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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815e3f33e286aeb22b6295953d384f220195f787319c5c47463081926d746a16' 
  AND token = 'gUYa7iXv9n6HQniUr1lFFZnn6NVcFJWC9gc1ORmb/F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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