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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64d31b870083468ff90cb5fd6359d1405e83c853b2ac6eabe0cdd3b0f37f4ae' 
  AND token = 'nNmMCdu0GHE+YGv2VuEy14JMl1FBqq3vWbJnHSYYjBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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