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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b01e3aab96d541a920dd596da86ede69a04cd13cd6c9020ddfec6d3f2df78c3' 
  AND token = '+Fm3d/s7ZFLOszwgh9KlBqL5RI6Ese/Sk9eY03Jkof4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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