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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48740f195ed491c167fccc96a1780989338dd7220c3e9c554d49f3402583cb5' 
  AND token = 'Uvh61NyhUyNlWuRGv3o6Hindx10vzAWyF3kMgdL8FqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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