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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f58474442e5e61f62856ef7690cc430dee83f5472c876aed98ea01c06311bcd' 
  AND token = '1xTIdBzF/GqNcjHCc3HxU54+NVky5Ak/X0ZX7UdjGV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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