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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c69b6643f80de095d2783bc4dda04d4c3b6142c82418bd5d62db84cdd4482ef' 
  AND token = 'l+OH40pwKHg7GvpNPtPUvT39SyXJ6Fe9BxFAyXqCGKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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