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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e8e305c3e35b59aa8aae9ed49b6756a0a8c33eb459991a177d208c8df24cc2' 
  AND token = 'Fzdkg9Y6unIuibSfsGblz9vdvjM8D60QkrWA9jdpdKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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