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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47a41c701f962554c58d1435813d529d114ad7db533049a73ad9a032b53d190' 
  AND token = '+2ggxgv07+Apdm+8RRBQQeLfPL56UZY8K4f5khiTpJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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