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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5043c1e1a1df9b69b6207f479fc6278c12d51bf9f3b95ccb0472bf6909b0dd' 
  AND token = 'Lb54mVHVehcVS4wTnwYi9JR6t6hC6FxEERPCu3ys9s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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