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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5816f8b5675e51c8dd0eb7421f5925624478e3057d867359c6548ebf7ef0234d' 
  AND token = 'Um0PKVyuYrf7uIqlSY7XShATW72fU1twD4RB/jC0N9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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