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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd111cc50588462753e3073ea21694a1979bb23fb59e7c22f4c8a1568749df5' 
  AND token = 'SV+b3xujhkEwCxN6Vh/yjD8/0ij2vnJE59g9gr/a0s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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