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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c44de5803ca3b38098cb6dde3a0bef379d40da999dbe35d461c3a2528ab3b23' 
  AND token = 'qu9A5BRwzJE/Jw3K79/L1ZuBWYygD/lG6k9JCtHoC8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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