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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b374639475bb20415411d20d441bc77383dd5bbce391ce07e13c0e7e47e5542' 
  AND token = '+J/CADHfInOJbWEuKGBhHqdZHLIsVUwPCG61rGtCr0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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