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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c658a713f8290b238b23b0ac0da027c0d2f48cdfa2a13f2f7633e66e901329b7' 
  AND token = 'eROKl37SIJh89xwLpLuBcuI22CmNiuEpsez9Rz41GqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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