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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658146260a1ca07229df82b2f845a6c75b488c04179c70ce9e9fa5d470efa74b' 
  AND token = 'yJK1GJ4Wu1Sdf8IniLbDt+EEX9FGqvDA9WNT88ttgcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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