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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8364055fe5973bc25cfff6e4a9f3e93c549e5588fd8d285335e8523a3f1fe5b' 
  AND token = '/8nns7GfcWsT6FleLuIElws30quzzzgAfuEPkeeXO9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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