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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a90f8f99bf5bb9923b03a8b5d028e26c7dae84fb9431a1e74b8a94d60a071e' 
  AND token = 'pH8lSqwVrVeZLj8UGfp4JkXK/bUePP4TS308t3yA8QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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