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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52c0ccc5f958958f814aa3892c36846f04dd807f6d1f4ae5c2f2de9f307b3a4' 
  AND token = 'MFZAjZKlJYQIAGbwSOll0HDwKvuiGnDcIr0epZ4QKyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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