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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3397b05ef51b02b0bb22343f67cd08fcfcddf3ae83878d8d8c195216f03013dc' 
  AND token = '38ilv4570XyRFPC47Ah//LZvlScxRWAoogwWW8X8RjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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