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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8964da1542b5f5b8b3b83f3ff4e250b45525a4dff3a13db45303d3c793199e' 
  AND token = 'ttACxgrud12yBDwvgdOMj/I/EhPtFepXIhPN/eVZk9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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