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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00da56cf2301a8fc0b48a0c24f892fcc6a53c41bb5eb9a26434b349785dd7361' 
  AND token = '0LfdzgX8937tTlkyz5VQpO3KBKbtX2YNrYI9kwrLowg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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