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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bf6f1cf24e1199bbe3e9877bd3fae14dd3bfbeaf86de82ff4e902fa386c2a0' 
  AND token = 'yOcn3t1GY2fQ91RR6bfjw17+LrzQdQLAEKULlZpfxVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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