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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bdabb3012a29c54e89a26b8438a5a3153a52ebefca9c95642aa704ac6448ad' 
  AND token = 'p9mP/1YGGuF/B7L6bpmWC+fw5W1NTJPuXlLuIkoDCVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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