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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ab3d390a5f894212dc5fa93acb6fbaefcb9384df9a2025ffe86ca9e47f73b1' 
  AND token = 'vueFcr3m+nV+b1hpqLFl8uNOTLgTDarOBhH4DLxX9OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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