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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6531c08c9d0c11392e9ab80e6363d1178cc7e1206857d24cc5928465ce06618b' 
  AND token = '577raOZ4f8dhhNKek8mXEhzisBDbXR2KC8jtIhyG1fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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