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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b809d85fedb58bb7ecd043b7c1a4ba41a2059c9e95245d6ca17c6eed07cc3e10' 
  AND token = 'aQmnUAMyD7/seayuGbcvIg818cg9NKkkRZnKL9o7FVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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