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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1ff45018454ff8d21ccab02ee62b22db9ed0c7170a770ddd3f33e55eefb58d' 
  AND token = 'nTPc/QD0xX/lxIhZKoUXIyt4LQSe816H/TnCo2J646A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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