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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223e43b0049bf12d7cedb3fa4ca3554203bf601eb23d7dced101dd0b1c5097d1' 
  AND token = 'nxUko/E5bsnz0IARGjJoAH20KsStuJ2jQ9lOFXbzbao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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