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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b868b4c98be66ab4f150cd5db1027b4bb30eaf10d439281bcb9a0868e0908cc4' 
  AND token = '9oR1uVKqy1+kCV/evrboWfaLlrhI13GID8CI+OEAKjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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