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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bd583e667f6b67cf9814e80f8830fc4fe4c9a5da0e49c28fe235a5517261b4' 
  AND token = 'hHO49QlYKamlVvaAcSuF35+l00wwLoIr426zm17u85Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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