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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255802c716cca426bc4e536e838e18f439891eb662ce6117bb8d5fc47a3c11c9' 
  AND token = '+OquZUF1EINaalCLe4vUjTK1B4J9ca8V5lPEXFisutE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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