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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812ce2a82d41d80c5ba503743825499c628552ed1e9dda6ff6f4ef9f8bdf9344' 
  AND token = '1RPVmGboDh35h/m6Mj6lR9R4G28IUtm5FSPMegNAh3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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